Have your happiest years come and gone or are they still years away?

If you think turning 40 will bum you out, just wait until you hit your mid-50s—that’s when regrets over unrealized goals really kick in.But don’t worry, some of your happiest years are still ahead of you. According to a new study at the Centre for Economic Performance at the London School of Economics, there’s not one, but two times in our lives when we’re at the height of joy and satisf